PPB_TCPSocket: add support for TCP server socket operations.

ppapi/shared_impl/ppb_tcp_socket_shared.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PPAPI_SHARED_IMPL_PPB_TCP_SOCKET_SHARED_H_
+#define PPAPI_SHARED_IMPL_PPB_TCP_SOCKET_SHARED_H_
+
+#include "ppapi/shared_impl/ppapi_shared_export.h"
+
+namespace ppapi {
+
+class PPAPI_SHARED_EXPORT TCPSocketState {
+ public:
+  enum StateType {
+    // The socket hasn't been bound or connected.
+    INITIAL,
+    // The socket has been bound.
+    BOUND,
+    // A connection has been established.
+    CONNECTED,
+    // An SSL connection has been established.
+    SSL_CONNECTED,
+    // The socket is listening.
+    LISTENING,
+    // The socket has been closed.
+    CLOSED
+  };
+
+  // Transitions that will change the socket state. Please note that
+  // read/write/accept are not included because they don't change the socket
+  // state.
+  enum TransitionType {
+    NONE,
+    BIND,
+    CONNECT,
+    SSL_CONNECT,
+    LISTEN,
+    CLOSE
+  };
+
+  explicit TCPSocketState(StateType state);
+  ~TCPSocketState();
+
+  StateType state() const { return state_; }
+
+  void SetPendingTransition(TransitionType pending_transition);
+  void CompletePendingTransition(bool success);
+
+  void DoTransition(TransitionType transition, bool success);
+
+  bool IsValidTransition(TransitionType transition) const;
+  bool IsPending(TransitionType transition) const;
+
+  bool IsConnected() const;
+  bool IsBound() const;
+
+ private:
+  StateType state_;
+  TransitionType pending_transition_;
+};
+
+// TCP socket API versions.
+enum PPAPI_SHARED_EXPORT TCPSocketVersion {
+  // PPB_TCPSocket_Private.
+  TCP_SOCKET_VERSION_PRIVATE,
+  // PPB_TCPSocket v1.0.
+  TCP_SOCKET_VERSION_1_0,
+  // PPB_TCPSocket v1.1 or above.
+  TCP_SOCKET_VERSION_1_1_OR_ABOVE
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_PPB_TCP_SOCKET_SHARED_H_